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United States. Bureau of Labor Statistics. "Occupational Outlook for College Graduates, 1970-71 edition : Bulletin of the United States Bureau of Labor Statistics, No. 1681,"
Occupational Outlook for College Graduates : Excerpts from the Occupational Outlook Handbook
(1971).
https://fraser.stlouisfed.org/scribd/?item_id=498661&filepath=/files/docs/publications/bls/bls_1681_1971.pdf, accessed on December 13, 2017.